High-temperature sintering furnaces operate at temperatures above 2300°C. The conductive electrode connected to the furnace core runs under these extreme temperatures. The other end of the electrode is connected to the copper busbar, which requires that the temperature at the junction remains below the melting point of copper. At the same time, since the conductive electrode is exposed to air, it must operate below its oxidation temperature. Therefore, forced cooling is necessary. Currently, there are two main cooling methods:
1. Direct Water Spray Cooling:
Drilled tap water pipes are horizontally mounted over the conductive electrode, spraying water directly onto the electrode and the junction with the copper busbar to achieve cooling. This direct cooling method is simple, convenient, and effective.
Drawbacks:
- Water splashing can seep into the furnace body.
- A drainage tray is required; if it becomes blocked or improperly handled, water can enter the furnace, reducing its service life and oxidizing the products inside.
- In northern regions, the drainage tray can freeze in winter, causing additional complications.
2. Internal Cooling:
Holes are drilled in the conductive electrode and sealed with plugs. Then, two tap water pipes—one long and one short—are connected, allowing water to flow directly into the electrode’s cavity and then drain out. This method cools the electrode internally and is more controlled than external spraying.